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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c8a6ef3c8ff19cb6b631c206a2bab3fb1237b39fc2fe24475312e72a48757a9' 
  AND token = 'PsnognShoblR5ar+WLeoQq9O/0rAGPdXvUCdyCbJftI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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