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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41b66647d63ab82502b4ed19d0d29990e26a4e32bb896df601e1c6a3ecb33be2' 
  AND token = 'kIQFyvF3rFsokv0rYVfA1z8FZgGoo/VhLkSGv92NgO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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