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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8166ae6fae6fb187fa8f9f67f8961dda0509c6ee3d95a0d9c554ce2d712738be' 
  AND token = 'D2AAKnTGYkhtWSuALHeH+PO98eXQyXmrg9+lSc9Ck0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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