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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b7ddf35bfaf03d885981aa68dc11964d7648b22023dc9d8018c103a1e35c3bc' 
  AND token = 'jfXdrlrsfOaBx9QP93tqvTZlpDvf8t4AVxv+Z9VaBqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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