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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88f7d1f8c98298df485f08cd4c2d46e42c919f15060d324ce120b538126022d9' 
  AND token = 'NEFZv/9nevTkIJ4RRtCqz/4wlPMmNLbUZpXTIg94NIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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