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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '740acc453ec6bce4d398fccd779b03f94f7b704f23b9cf86007edf535d5ea9a2' 
  AND token = 'Z2hbOW1h9jh9IeLgG9GF5QFTxubnPc8ZuHhll//AQSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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