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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2f7342c1253ca9139d4ea86c80f6e221c0bb0ec5e6977e2be2a302546740d8b' 
  AND token = 't84AmcbcsIfBcvwNTV46Sng0WVj6lBe+4TyA4vSYOnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}