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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '485b5a7b22e752314a5fd7e743668c254e00ffacbf9556bb4d80bbcb83d2ef31' 
  AND token = 'jEmQ6DPs6LKOc3M6foPKkYCTR52eOs+yTi0bZe2VK7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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