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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d4cebd7a078c9d017d8f1b41a1e9e2df7f9f32eb2d379be19574a8bef5076d4' 
  AND token = 'ZkFXQK39HtfpQ5F7zLYM96V+CBTDXrARH936Lqy5koc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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