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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2078032f0b60b6fa7d95e6bdd70a8d0831dd50bc4f3bc90b65a1842ddabbf29e' 
  AND token = 'okr0riIeSsCLNl4j+dimavLjxgEyzzWKDhz267K4StE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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