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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b3ccc020e203e994ae0e2641f3c1e22f35f296ed532d32a233e546d472e9029' 
  AND token = 'qxNjciXAf+Mbk6iYiK/yF9mMM9A759CaZLJedGqD3aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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