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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdea9ab54d4bce77092f19d8c039a810a48b55bfa462ce8a143deba609ee6ef3' 
  AND token = 'mOH5xbyX6jjSTI0Poq11URb1ZtcQtD6NU58ZEse2hbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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