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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62c38c89e47894904a9392637e53538e534eaddec72b1e250d653a06a34e04c2' 
  AND token = 'do4+TvxXh6OuhU3zWmqj2z1D3N5K6EbD312ciB810cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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