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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '638ad86432e68ddff8857341211ae7be03e6e99a3191286dc69cb3dd9996e6e0' 
  AND token = 'i5G6GNJks1va3i+KoPVwvFD6OyiuJVLDhlzFW8ou4Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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