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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '090c7038a0263d5ec1ff2336e9a5d4d5e398c7c1a55851bd16a2dab506708778' 
  AND token = 'nM8cXND3h10A8HiGWLAi6MJH64aJMA0ID+hXHbkDkUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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