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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8213bd72add5e427db757ee8a01fd7998412d15f100d6b69400e8540db095ab3' 
  AND token = 'yW1gM8cVnbURlG+9977Z1YvfQn8dnOQri+sLNZshXv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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