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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '788298ef9c2020a2621ceb122c797bfd5ceeaa790d72105515111ed3bf35267b' 
  AND token = 'kKrduN6xvMrsa9Bmsj/0apbv5NBlLZn7YTezLHy5CYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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