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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01de42f28c67ec877941f4f3f147709d24cc2cb432e8dc1d94dd608d4b3c88f6' 
  AND token = 'BOpZlGVOcBFZICH7O1uwH31zcns/yg6THORZRg34tZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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