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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13ecdfb23b4cef4c34743d7864122b771ef252f80081665124068da31cec46c7' 
  AND token = 'ecgm+LgbvAT0U3IV2k7quHMbDLTYt8oEQG6oINWYMQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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