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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1873c29fbeead863b98acb8d038da0990c9dbc26192df28fb2f43365d9b493b9' 
  AND token = 'cT0Nv9URdSvDexU/ZAxknBbKx0gtdKhnJR13JYYdduI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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