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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b1df38dbba7a8e0d99b4edf9e0d53a697d22c0b4d6fcc4afb2a5fd4db7db15d' 
  AND token = 'kG1NB/dSfalVoNd+Xt1eC0yB+MGTqcZEQtbIkkdLhms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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