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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd67735573f279d4820f4d3eb53681d020d1da125c953d3bde12615f4333cdce4' 
  AND token = 'LnxOd568zNdLxZNh0PgNIXQr32Jmkru4eigIF53+26Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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