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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a8774a3394b1891ab9fb91007de6e6b6fb890d80b06c9c21dc1d49b47cf19a8' 
  AND token = 'ZkCHNoIqtE6H/4utVkSdeYA8AgMa8ZcbZ0HJ3vwfOzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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