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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb040fbe58ac344870ef2aa2e55a2f10dccf333f660594d53af9ff24b4afafd8' 
  AND token = 'rwiVquaBroFSOLbud+HfOPoLd2oXIuhIQBQKQGP1oP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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