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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '788b9a7a1e8689dbfc7a849614b51c28b737a0d953b5aa7f2b447b45bb09fb2b' 
  AND token = 'Ti0lzSv+niMTdx64E9TMVOZnXZLj1Esr6VKPEDs9ioE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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