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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c1b7b893df5f9fee392491d8c4d6d3f6961488dd57698632cd19fa63d2d0000' 
  AND token = 'RB3+tHM8pyY9EgzqTFxyzqT9f6PXzTP4IwVi38sy2o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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