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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e48800e9e62ab2904646050771260e9b48d4ffb0ab48af2a67a6f25d0e34f0a' 
  AND token = 'TOaPXuyeGlG5o7p4UUJx76eewDrRzJE0/xvUK4fm6HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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