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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4033d6e6012c27dfddfd8be82fdde741658261ed45b94d2ff2e5ae04f284cac' 
  AND token = 'LiNRXph94X8gZobuJa6CUwsETnhzaf16Z853KLWaFuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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