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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bae2f48915bf9d506c34fc599a9e0096477546fec70a81f37cc65b4da55a8093' 
  AND token = 'm8tXKtbtNCr0+mRXySI/1y9RHklCAkF2CMy489ZC7P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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