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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '602b162bb0d887c11517b6c708b1d75b586522ab0f57cd5a32d9443101b4c8a4' 
  AND token = 'y7V32UGoIkt9JxrxL0M3eAIan/Kmuf+LDFG8JXEnWKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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