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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd40928241b759cf173a844f2505e418b0626ea79f242e1352322f36305d16612' 
  AND token = 'lFL16HvotFXMVqE3EhlqT08CB+mQtDP2BBT0+vsadvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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