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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd33cc08716ba3f2bda3e6c54bd7e058a29e2f0e3df4db6a0ab3e352c7930ee84' 
  AND token = 'M7O2zZQmHfRXTtHAZChNR1r82FbY1JI4/HodVB/7b+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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