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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4404602dbd58a075f97282f4400266597c9e50aa7aed8f733b48815fcac904d' 
  AND token = 'kHTxveRmJGm3gdpM4OYgpow6t4aKgfEM433W86Rxjuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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