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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85e1e6d2de6622d38c0e4c01a0f7edbe577a7b63988ecd25c6c0baa95c1de74b' 
  AND token = 'exD+NVy/nhU7C6GiDgi7eIdg1LZEWOd3DRQ4pHqjWCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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