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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebbb93cfc76dda7af86da37f02f691da325277d94d9802d0a33c764beaca3f4f' 
  AND token = 'V1lYdnLtt6rDOVDbkECJDegOhikOs4Du79zR74hkzTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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