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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccf97cdae226deb9e8c359011fd1abf4cc41c7de3d63094b388dfda20273eede' 
  AND token = 'Gx3webjLE6PDIcwQ0UdbcD2qIEQIgdNOnKelSqIU0eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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