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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd74300d050a4e9e1c5455392a8b79dbb24e6288c003b687d259f2fbdf4e1bba0' 
  AND token = 'WNK7AE/iO2WR0hq4T66DSxB0psUOlHlsBTWDutGOcF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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