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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3feb89f79165f52b9cbf4a418ca120207fc0915e89f2ab0cff25f2225247e5f' 
  AND token = 'P8y3nnOjhl1xkH74S5iuxXr/L8xc4fMmPB0rvgQlFcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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