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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8507e3946670cb072c29b490b7915d43e88101bc6e4caade1d7162a5f282c8c5' 
  AND token = '3TSZg5coGXWR8Gpm6pbb+fBWcmEPSGrfnKp8qjaX6ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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