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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3980e87fa3002040b20babe2887e72695c1aaafd93c2c40b26d456b4dad6970' 
  AND token = 'QeEQW314lcjb8JRXxHrREh7jnFpFPtSIuEjgGxpjjsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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