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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6ba21916937d779251b83c2e33ed3afb49e99263e696a45e360ce1c4d5a43cf' 
  AND token = 'UrsuTLU4YZW4/yeP3IQBwWYrIo+fQCJ8F1DvU7xyd50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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