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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53bc37fa19494a1cfe8969e43e7be6d51ed2cd5fbf7bf6eabe83059645c08d6d' 
  AND token = 'z+sjenECdxtq8duhGpo9mWXRcFhrhIpA4qddawoPdyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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