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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ab38dc5094de332c4f8c699cd18833e25cf6ff1fd10ae983b5ad5485fe3fbd7' 
  AND token = '/pvmJV7YuS7jC2vC3MNapTJPmexN1U2sv6YsiXwsdU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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