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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdd4a3723f003d1e5565fd6616538b0542711ac4d7e4914a04f3bab7c871b782' 
  AND token = 'SmJsVwPqn88g2V1IRWNZ2pfTwpcc9T9+yMRBTEb568I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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