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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6acec735a250dc4c9fda033428b955b07ac43545da31c526486cfcdf400a684a' 
  AND token = 'trFlZxHw0WdX2S0nHhHVFyYzm4H3uwrg3OEItlEJAvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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