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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c59029b26e530e283a55e758ab6c61770bb4c646f2db5ec85d9314bb518391c' 
  AND token = 'LsiSMbNQSdfss4WUioY3ns67lVO1d+KBZDOvCzHNA2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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