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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d88169402fc9a6e405d4aaf2090cdffec58c8d1d8baa59f47231aaeba7eec0b' 
  AND token = 'K5R3z6zkunc14bCb5CQW1FC9OUg/0fF28pNaepdVUPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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