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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '480b28b99c4c45dac695a89f85eada5ff6128154f28fce84e936a950b6f41c21' 
  AND token = 'X6celUsYDkyYuRWiDyu5DH7fTgFBV0TU+oYZvfncwKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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