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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0dcf6fa627f15c15f87af34b1e1b42bc8cacd83cb42d21955cb12a1138cb3e5' 
  AND token = 'v7FaixOU8LShBVbElR/7NHG2OKmoG0bYyGncRbBBSd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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