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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af6e9763374a2d375a3ad9cd4f03390f4c00592c0f3145a56a656b3e33eb9d36' 
  AND token = '3rRMpeKtUruPup7qWH1/ValLpU+mFWfPWzZvRPXOAbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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