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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '257aedeb27c8e20f79e9a58c8f72649a031a0848c6643c3d15bc21271fefce02' 
  AND token = 'CLnG1ZWco/AxPtewnIonkOjik2hP/xJkogpPQxlPa7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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