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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '118d9a33c31b12b7be8d59cfad1af199b1241681564692ef8aa2bd7581dcd531' 
  AND token = 'Eq2Slf0hC+QOr6SI0/YdAsDSESDy5S1ujs0AvqpRX94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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