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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad238b9e9aaa9cb408af3db54fe686c0a7b97302b4b43ad47e51b18675ea8824' 
  AND token = 'MZOJIr4uh+4nadLxOsIVFFhlYI97k5Rya4mjwzulZA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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