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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9473127bcbd0e5e24e0734e54af3a3fde0889561af0d7aea7a6e71f9e08a2941' 
  AND token = 'EsqWa5LEVHfpTUUK4AlcjjntG6JzmNKyLLEVuffznQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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