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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4aacd1635ebb5497444b938064f8f52ace6daa042a2e29dbeb6b6b99c4e6430' 
  AND token = '3eAIS8b0pW8ybYf6kYaQr7pEt9De0xCzyr2TH5Mhna8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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