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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2e2ef7142ed8a68e3f862f2bfb2c2a7d29b9f76e8f1da6410c6572d2f88473e' 
  AND token = 'hVXhoqDDZs2aMnmhyCiSLQqejs7mSuDIMiBApvhv76A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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