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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9781e43b69d5f3644be51ca6c29148effa5fc0d23b40516ddef76b22aa131f7' 
  AND token = '/iJdNtrK4iM5Z/RseLXE48xd32Ef7dWA5/mEoeqh6Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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