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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26f60e37e1608a65758693ed59f0f0aa57a6c89f9095f18591643cc5ce52b9ed' 
  AND token = 'pNG1Nn1gjsBuG24c0wc5rlrMXbkx7QUhY0p/ZK8lUOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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