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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7594c81c5d665bd449b6fbc49c869a064464d8a8dafe3fb7238e228646db877c' 
  AND token = 'b2iiVtcbXUvikU3t/q9ROSm5xicuZiS0yoJqCBi1vag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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